Well, judging by the way everything happens, the girl has long dreamed of such sex and I think it's not for nothing she decided to pay in this way, there is either a lack of satisfaction in terms of sex or just experience is already there. Overall, he fucks her perfectly, she really likes it, judging by the moans and sighs, and the time has exceeded all her expectations, most likely he will appear in her bed more than once.
That's what a personal assistant is for, to always be there when the boss wants her to be. And to do what he demands. This man wanted to relieve the tension - the assistant was at hand, without hesitation and took advantage of her. According to her cries and sighs conclude - this is the work she likes!
I want a roommate like you!